Connected: An Internet Encyclopedia
RFC 1035 - 3.3.9. MX RDATA format

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### 3.3.9. MX RDATA format

        +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
        |                  PREFERENCE                   |
        +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
        /                   EXCHANGE                    /
        /                                               /
        +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

where:

    PREFERENCE      A 16 bit integer which specifies the preference given to
                    this RR among others at the same owner.  Lower values
                    are preferred.

    EXCHANGE        A <domain-name> which specifies a host willing to act as
                    a mail exchange for the owner name.

MX records cause type A additional section processing for the host specified by EXCHANGE. The use of MX RRs is explained in detail in [RFC-974].

Next: 3.3.10. NULL RDATA format (EXPERIMENTAL)

Connected: An Internet Encyclopedia
RFC 1035 - 3.3.9. MX RDATA format